Fluid speed-regulator for elevators



(No Model.)

W. E. NIOKERSON.

FLUID SPEED REGULATOR FOR ELEVATORS. NO. 396,107. Patented Jan. 15, 1889.

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NITED STATES PATENT OFFICE.

IVILLIAM E. NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

FLUID SPEED-REGULATOR FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 396,107, dated'January 15, 1889. Application filed September 21, 1888- Serial No. 285,996- No model.)

To aZZ whom it may concern.-

Be it known that 1, WILLIAM E. NIcKEE- SON, of Cambridge, in the countyof Middlesex and State of Massachusetts, have invented a certain new and useful Improvement in Fluid Speed-Regulators for Elevators, &c.,o1:' which the following, taken in connection with the accompanying drawings, is a specification.

The object of my invention is to so construct a fluid speed-regulator device of that class in which a piston is used that anyleakage about the piston-rod is compensated or balanced at each movement of the piston to and fro. This object I attain by the mechanism shown in the accompanying drawings, in which Figure 1 is a longitudinal vertical section of my device. Fig. 2 is a plan of the same, and Fig. 3 is an end elevation of the same.

The cylinder A is made of any suitable dimension and of any desirable metal or metals. IVithin the cylinder A, I have apiston, B, Fig. 1. This piston has a piston-rod, D D, which moves freely in the boxes D D The boxes D D need not-fit the piston-rod D I so closely as to create any friction, as it is not essential that they should be fluid-tight, from the fact that I have made provision for any amount of leakage that need occur with loosely-fittin g or frictionless boxes at D D.

-O and C are tanks, one of which is attached to each end of the cylinder A. The object of the tanks C O is to receive the leakage from the cylinder A through the boxes at D D', Fig. 1. The tanks 0 C extend somewhat above the cylinder A, and are to be kept nearly full of fluid, so that the fluid-level in them shall always be above the boxes D D II is a reciprocating rod attached at H to a pitm an or other appliance for uniting my regulater to the mechanism to be regulated.

The reciprocating rod II is connected to the piston-rod D D by means of arms F. E and pins or screws S S S S, and slides in bearings at K K K -K.

For convenience in filling the cylinder A, I have an opening and plug at L, Fig. 1.

P, Fig. 1,represents a pipe leadingfrom one of the tanks 0 C to the other, and serves to maintain an equal level of fluid in the two tanks.

The piston B has openings, as indicated by dotted lines at I; b 1), to admit of the passage of the fluid in the cylinder A from one side of the piston to the other as to traverses. The number and characteristics of the openings at b b may be varied to suit the requirements of the machine to be regulated.

I claim 1. In a fluid speed-regulator, the combination of the cylinder A, the piston-rod D D, and the piston B, having opening Z) I), with the fluid-tanks C (1 substantially as described, and for the purpose set forth.

2. In a fluid speed-regulator, the combination of the cylinder A and piston B, said cy inder A and piston B beingadapted to admit of the passage of fluid from one side of the piston to the other, with the fluid-tanks C C, substantially as described, and for the purpose set forth. I

\VILLIAM E. NICKERSON.

IVitnesses:

FRANK G. PARKER, WILLIAM EnsoN. 

